A study is going to be conducted in which a mean of a lifetime of batteries produced by a certain method will be estimated using a 90% confidence interval. The estimate needs to be within +/- 2 hours of the actual population mean. The population standard deviation σ is estimated to be around 25 hours. The necessary sample size should be at least _______. 21 923 100 35 423

Q: mean distance is 39 miles and the sample standard deviation is 6 miles.  Assume that in the…

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Q: 1. statistic practitioner drew a random sample of 400 observations and found that x̅ and .…

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Q: A random sample of size n1=23​, taken from a normal population with a standard deviation σ1=5​, has…

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Q: A 95% confidence interval for the mean hours freshmen spent on social media per day was calculated…

A: Solution: From the given information, the 95% confidence interval for the mean hours freshmen spent…

Q: A confidence interval for the difference between the means of two normally distributed populations…

A: Confidence interval is an inference process which gives the change of plausible values of population…

Q: A random sample of 36 is selected from a normally distributed population and provides a sample mean…

A: Given that Sample size n = 36 Sample mean = 23.9  sample SD s = 6.9 The critical value of t at (n -…

Q: A sample of size n = 47 has a sample mean x = 58.2 and sample standard deviation s = 9.6 a) A 99.8%…

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Q: Given a sample of size n=20 and the sample mean of 10 and a standard deviation of 3, find the…

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Q: according to the International Journal of Retail and Distribution Management (Vol. 39, 2011) survey…

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Q: 8. A sample of 16 gas stations shows that the mean price for regular gasoline is x= $3.25. It is…

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Q: Q1: A business school placement director wants to estimate the mean annual salaries 5 years after…

A: Obtain the 90% confidence interval for the population mean annual salaries 5 years after student…

Q: A sample of 49 observations is selected from a normal population. The sample mean is 61, and the…

A: From the provided information, Sample size (n) = 49 Sample mean (x̅) = 61 Population standard…

Q: The bottlers of a new fruit juice daily select a random sample of 12 bottles of the drink to…

A: Given information: The sample size is 12. Sample mean is 12.03. Population standard deviation is…

Q: If the 90% confidence interval for µ is from 40 to 50, then the sample mean is M = 45. True False

A: Note: since you have posted multiple independent questions in the same request, we will solve the…

Q: 6. A sample of certain observations selected from a normally distributed population produced a…

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Q: An agriculture publication daims that the population mean of the birth weights for all Alpine goats…

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Q: In a study of the length of time that students require to earn bachelor's degrees, 50 students are…

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Q: A sample of 20 observations shows a sample mean of 290 and a sample standard deviation of 30.…

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Q: 4. A machine produces nails whose lengths are normally distributed with mean u cm and standard…

A: Give: sample size n = 50 Confidence level = 98% Significance level α = 0.02 ∑(x-3)2 = 425 where x is…

Q: A random sample of 10 employees of a company was selected to estimate the mean one-way commute time…

A: Given Information :  A random sample of 10 employees of a company was selected to estimate the mean…

Q: The mean birthweight for a 100 birthweights from Wong City Hospital sample is X- 3827 grams with…

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Q: 1. A researcher is conducting a study to determine the mean trough dosage of medication for a…

A: Margin of error (E): The margin of error for sample mean is given by,

Q: atn] Eight squirrels were found to have an average weight of 9.7 ounces with a sample standard…

A: The provided sample mean is Xˉ=9.7\bar X = 9.7 and the sample standard deviation is s=0.2s = 0.2.…

Q: Which of the following is the best estimate of the range of a population value given the sample…

A: Confidence interval is known as the probability that a population parameter will lie between a set…

Q: Which of the following is the minimum sample size necessary to construct a 99% confidence interval…

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Q: In a manufacturing process a random sample of 22 bolts manufactured has a mean length of 3.1 inches…

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Q: A sample of 150 brand A light bulbs showed a mean lifetime of 1392 hours and a standard deviation of…

A: Option C is correct

Q: 1. A company manufactures LCD monitors, which have a lifespan that is approximately normally…

A: The provided information is  x¯=180σ=96n=21α=0.05The critical value is zc=1.96  (from statistical…

Q: (PX) time (in minutes) of college students to write an error-free program (y). Assuming normality of…

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Q: Ch The Ball Corporation's beverage can manufacturing plant in Fort Atkinson, Wisconsin, uses a metal…

A: Confidence interval give a range of values for the unknown parameter of the population. The width of…

Q: Given a random sample of n = 17 subjects drawn from a normally distributed population with sample…

A: Sample size, n = 17 Mean = 130 Standard deviation = 40

Q: For a population data set sigma = 12.7 How large a sample should be selected so that the margin of…

A: Given that standard deviation (σ)=12.7Margin of Error (E)=3.20confidence level=0.96

Q: 4. The mean and standard deviation of n measurements randomly sampled from a normally distributed…

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Q: Based on a sample of 34 randomly selected years, a 90% confidence interval for the mean annual…

A: Given, sample size = 34 at 90% confidence interval is (47.5, 50.5)

Q: Q2: Given the samples from normally distributed populations with the unknown standard deviation.…

A: A confidence interval, in statistics, refers to the probability that a population parameter will…

Q: A random sample of 12 students showed the following time (in hours) of sleep 4.5 5 5.5 6 6 7 7.5 7.5…

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Q: (b) A sample of size 15 drawn from a normally distributed population has sample mean 35 and sample…

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Q: It has been reported that on average, college students spent 3 hours per day watching YouTube. A…

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Q: To assess the accuracy of a laboratory scale, a standard weight known to weigh 1 gram is repeatedly…

A: The confidence level is 95%; standard deviation is σ=0.01; and E=±0.0001

Q: 6) According to the International Journal of Retail and Distribution Management (Vol. 39, 2011)…

A: The variable is number of hours spent shopping on Black Friday. We have to find out the sample size…

Q: A population has standard deviation ? = 21.3. a. How large a sample must be drawn so that a 99%…

A: Solution: The following terms and their values are given to us: Population standard deviation: σ =…

Q: Create a 85% confidence interval for a population mean from a sample of size 65 with sample mean x =…

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Q: single burger contains a mean of 100 g of cooked beef with a standard deviation of 5 g. The…

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Q: A random sample of nmeasurements was selected from a population with unknown mean µ and known…

A: Identify the correct option for the 95% confidence interval for the population mean. The correct…

Q: Find a 90% confidence interval for the mean if a sample of size 12 has a mean = 34.2 and the…

A: The sample size is 12, sample mean is 34.2, and sample standard deviation is 8.5. The degrees of…

Q: Suppose we have a population that is approximately normal with standard deviation a=2.4 If we want…

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Q: 8. A sample of seven observation given as; 10 8 13 15 6 8 13 Construct a 98% confidence interval for…

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Q: 1. Test the hypothesis that the random sample 12-1 12-3 118 119 12.8 12.4 came from a normal…

A: Given that,        μ0=12.0        σ=0.4        n=6  1-α=0.95 The random samples are 12.1, 12.3,…

Q: A random sample of 24 army recruits has a mean height of 68 inches with a standard deviation of 2.3…

A: Given , n = 24 , mean = 68 , tandard deviation = 2.3

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.